This is totally normal for Koreans, I´ve been working in shipyards in South Korea for about a year now, and this is normal procedure for Koreans. But it is not only a friday thing, they are shit wasted drunk and sleeping in the middle of the streets every day. You cannot go to work without seeing at least 4-5 drunk koreans sleeping on the sidewalk or in the streets... and this is every day...

Never saw this in real life... But Ive always been at Seoul area so maybe this doesnt happen at downtown? Or maybe Im just sleeping in that time already :PBUT this definately happens in Finland at summer (hmm and sometimes at winter too).

And I thought Koreans party more on saturday nights? Coz many still work on saturday and only have sunday off...